<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>secondHTML</title>
	</head>
	<body>
		<h1>This is the secondHTML!</h1>
		<button onclick="window.location.href='index.html'" type="button" id="add">点我返回</button>
	</body>
</html>
